Here’s a milestone you might not have heard about: It’s projected that this year, for the first time, more college students will take all of their courses online than will take all of their courses in person.

Online higher education has come a long way since its predecessor, the correspondence school. The universal shift to remote learning during the pandemic only accelerated that momentum. It has also allowed more comprehensive research into whether online teaching works as well as the in-person kind.

But even as more students go online to learn, there are many caveats about this fast-growing innovation. We talk to the experts about who should take online courses, where they should take them and in what subjects. We also lay out questions to ask of online providers, such as what kinds of real-world supports — faculty office hours, tutors — are available.

Finally we solve a mystery that frustrates countless consumers: how in the world it’s possible that most online courses cost as much as, or more than, the brick-and-mortar kind. After all, technology has lowered prices in almost every industry. Come with us as we expose the reason higher education can find a way to charge more for yet another product that by all rights should cost less.